(2007). Why is math so hard for some children?: The nature and origins of mathematical learning difficulties and disabilities. Brookes.
Chicago-Zitierstil (17. Ausg.)Why Is Math so Hard for Some Children?: The Nature and Origins of Mathematical Learning Difficulties and Disabilities. Baltimore, Md. [u.a.]: Brookes, 2007.
MLA-Zitierstil (9. Ausg.)Why Is Math so Hard for Some Children?: The Nature and Origins of Mathematical Learning Difficulties and Disabilities. Brookes, 2007.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.